Dreams are 2-ways however IT MUST BE INTERPRETED FROM YOUR OWN PERSONAL LIFE not with a general perspective.
1st-way; Dreams can be complimentary that is *manifesting something you have desired in your conscious mind while you were not sleeping* hence in this case check your relationship/thoughts as it concerns studies/education/examination in your life before the night you had this dream.
Second-way; Dreams can be supplimentary that is coming from the spiritual realm either positive-dimension which is THE HOLY SPIRIT hence as a message or revelations, here you just pray to God in order for it to manifest in your life or if you are not clear about its content then you ask the Holy Spirit to give you more details/clarity as it pertains to that dream.
Do not be scared/worried/anxious/fearful when you have not received clarity, the same God who gave the dream will bring its explanation at his appointed time{Habakkuk 2:3, Gal.4:4}. Within the supplimentary-aspect, it could also be from the negative-realm which devil/demons hence as attack/initiation/intimidation, here you just wake up with faith-filled prayers esp. Luke 10:19,Matt.18:18 Eph.1:21, Eph.2:4-6 and rebuke/reject/renounce them and BELIEVE IT IS SETTLED BY THE HOLY SPIRIT {John 19:30}.
As it regards writing Exams from God, it could be *examine yourself and know whether you are still living THE FAITH IN CHRIST JESUS* (2 Cor.13:5), it could also mean that there is future task you need to start making preparations.
from the dark realm it could be a ploy to take you back your past/low-life.
In all these you need to ask THE HOLY SPIRIT TO GIVE CLARITY ON YOUR DREAMS AS IT CONCERNS YOU and stay away from accepting other peoples' opinion or interpretation to avoid REGRETS{"When the Holy Spirit of Truth COMES, He will guide YOU INTO ALL THE TRUTH; for He will not speak on His OWN, but will speak whatever He hears and HE will declare/reveal to you the THINGS THAT ARE TO COME(FUTURE REVELATIONS OF A PERSON/FAMILY/NATION/WORLD AND ITS CLEAR EXPLANATIONS) John 16:13}.
I pray for the HOLY SPIRIT REVELATION in your life in JESUS NAME. AMEN.
GREAT GRACE BRETHREN!!!

Good one,